Analog Devices Inc./Maxim Integrated MAX6836WXSD1

Overview

MAX6836WXSD1 from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit designed to monitor +1.665V supply rails in low-voltage digital systems. It asserts RESET when VCC drops below 1.665V (±2.5% over temperature) or MR is pulled low, with a fixed 1.5ms timeout after recovery. Its 7.5µA typical supply current and SC70-4 package make it suitable for portable equipment power monitoring.

For engineers reviewing the MAX6836WXSD1 datasheet, MAX6836WXSD1 pinout, MAX6836WXSD1 application, or MAX6836WXSD1 equivalent, key selection criteria include its active-high reset output, debounced manual reset input, 1.5ms timeout period, guaranteed reset validity down to VCC = 0.75V, and compatibility with 1.2V–1.8V µP supply domains.

Technical Context

The MAX6836WXSD1 implements a precision voltage comparator with 444mV internal reference and ±2.5% threshold accuracy across –40°C to +85°C. Its reset logic includes a fixed 1.5ms timeout counter triggered by either VCC falling below 1.665V or MR assertion.

It features an internal 20kΩ pullup on MR, supports CMOS-level manual reset inputs, and guarantees valid push-pull RESET output down to VCC = 0.75V with VOH ≥ 0.8×VCC at ISOURCE = 10µA. The device ignores transients <100ns on MR and <60µs on VCC.

Key Specifications

Pinout & Package

MAX6836WXSD1 is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained PCB layouts in portable and embedded systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP supervisory applications.

Compared with MAX6836WXSD1, MAX6836WXSD3 provides longer reset assertion for slower power supplies but sacrifices responsiveness in fast-recovery systems; MAX6316HUT46 offers similar timing but increases board area and design complexity due to larger SOT-23-4 footprint and missing integrated MR debounce.

Availability

MAX6836WXSD1 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, industrial PLC I/O modules, medical wearable ECG front-ends, and automotive body control modules requiring stable component supply across extended temperature ranges.

Supply support for MAX6836WXSD1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6832–MAX6840 family delivers ultra-low-voltage supervisory circuits targeting 1.2V–1.8V µP domains, emphasizing minimal quiescent current, high threshold accuracy, and robust transient immunity in compact SC70 packages.

FAQ

What is the exact reset threshold voltage of MAX6836WXSD1 and how stable is it over temperature?

The MAX6836WXSD1 has a factory-set reset threshold of 1.665V with ±2.5% accuracy over the full –40°C to +85°C operating range. This stability is achieved via laser-trimmed internal resistors and a precision 444mV bandgap reference, ensuring reliable detection of 1.6V supply brownouts without external calibration.

Does MAX6836WXSD1 require an external pullup resistor on its RESET pin?

No, MAX6836WXSD1 does not require an external pullup resistor because it features a push-pull active-high RESET output. The internal driver actively sources current when RESET is asserted (HIGH), eliminating dependency on external components and simplifying layout in space-constrained designs.

What is the minimum VCC voltage at which MAX6836WXSD1 guarantees valid RESET output operation?

MAX6836WXSD1 guarantees valid RESET output down to VCC = 0.75V. At this level, VOH remains ≥ 0.8×VCC with 10µA source capability, ensuring compatible logic-high signaling to µP reset inputs even during severe brownout conditions before complete power failure.

How does the manual reset (MR) input of MAX6836WXSD1 handle switch bounce and noise?

The MR input of MAX6836WXSD1 includes internal hardware debounce that rejects pulses shorter than 2µs and filters transients up to 100ns. This eliminates need for external RC networks when interfacing with mechanical pushbuttons, reducing BOM count and PCB area in portable equipment designs.

Can MAX6836WXSD1 be used to monitor supply voltages outside the 1.2V–1.8V range?

MAX6836WXSD1 is specified for monitoring supplies from 0.75V to 3.6V, but its factory-trimmed 1.665V threshold is optimized for 1.6V–1.7V rails. For other voltages, Maxim offers variants like MAX6836HXSD1 (1.313V) or MAX6836FXSD1 (1.050V); using MAX6836WXSD1 outside its intended range risks premature or missed reset assertion.